De Grey Mining Limited (ASX: DEG) has obtained impressive extensional and impressive definition results at the Falcon intrusion at its Hemi Gold Discovery, located approximately 60km south of Port Hedland in Western Australia.
Extensional drilling at Falcon has identified strong mineralisation to 300 vertical metres. Mineralisation has also now been extended to 500 vertical metres in drilling on 160 metre line spacing. Drilling will continue at depth following higher grade lodes. Mineralisation remains open below 500 metres,” Manager Director, Glenn Jardine, said.
“Resource definition drilling above 300 vertical metres has intersected strong mineralisation at encouraging gold grades over wide intervals. This drilling is being conducted to support the maiden resource estimate due for delivery in mid-2021.
“The company is also conducting RC drilling across Greater Hemi. Drilling continues to the west and north of Diuconand Eagle. A wide spaced RC drilling program is in progress at Scooby testing geochemical and induced polarisation (IP) anomalies. This drilling is expected to be completed in June with results following.”
The Falcon intrusion is located approximately 600m west of Brolga and immediately south of Aquila. Strong mineralisation has been defined over a strike length of approximately 1km \ The bedrock mineralisation is covered by approximately 40m of transported material. This cover is similar to the Aquila, Brolga and Crow deposits.
The mineralisation at Falcon is intimately associated with highly brecciated and extensively sulphide altered portions of the north-south orientated subvertical intrusion. The style and intensity of alteration and brecciation is similar to the nearby Aquila deposit.
Extensional Diamond Drilling
Step-out drilling to a depth of approximately 500 vertical metres is testing the potential for extensions to known mineralisation. A string of six initial step out holes have been drilled at a 160 metre line spacing along the current 1km strike at Falcon. The initial step out holes, from north to south intersected:
- 20.3m @ 1.4g/t Au from 491.5m and in HERC580D;
- 11.8m @ 0.7g/t Au from 471.2m in HERC579D;
- 5.7m @ 0.6g/t Au from 532.3m in HERC581D; and
- 63.7m @ 1.5g/t Au from 263.3m in HERC408D;
The deep holes at Falcon intersected wide zones of intrusion with mineralisation. The mineralised system remains open below 500 vertical metres. Drilling continues at Falcon to follow higher grade lodes below 300 vertical metres.
Section 7691920N shows the continuity of mineralised system to at least 500m in HERC580D, and mineralisation remains open at depth. Section 7691400N shows the mineralised system increasing in width and gold endowment below hole HERC263D in HERC408D and HERC588D and remains open at depth.
Resource Definition Drilling
Resource definition drilling continued at a nominal 40m x 40m spacing, with some sections still at 80m x 40m spacing to establish continuity for resource estimation purposes. This drilling has been conducted to a vertical depth of approximately 350m along the current 1,000m strike. Additional impressive intervals at Falcon include:
- 38m @ 1.1g/t Au from 75m in HERC593;
- 37m @ 1.6g/t Au from 119m in HERC594D; and
- 12m @ 1.8g/t Au from 47m in HERC592
Section 7691520N shows wide zones of well mineralised intrusion through HERC553D and HERC416D with mineralisation remaining open at depth.
The Falcon intrusion extends for at least another two km to the south of known mineralisation. Drilling across the southern area to date has not defined significant mineralisation. However, the bulk of this work is wide-spaced, shallow aircore drilling. Deeper RC drilling to effectively test this area in more detail is also currently in progress.
